Method and apparatus for molding ophthalmic lenses using vacuum injection
US5632936A · kind A · utility
59Cited by
10References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1994 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | May 4, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lens mold cavity is formed and then evacuated via a vacuum channel contained within a mold member. A fluid valve is opened to expose the lens mold cavity to liquid lens material, whereby a vacuum of the lens mold cavity draws the liquid lens material to fill the lens mold cavity. The fluid valve is then closed and the liquid lens material within the lens mold cavity is cured to obtain an opthalmic lens such as a contact lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.